I am running XAMPP 1.6.4 and have had no problems for a long time. Yesterday, my PHP/MySQL applications were running just fine. Today, they are running VERY slowly. There is about a 10 to 15 second wait for each record retrieval or update. As far as I know, nothing has changed on my system.

I went back to a backup made about a month ago (a backup of the entire XAMPP folder). It, too, is now running slowly.